Tracing for NavigationHandle lifetime and state.

content/test/navigation_simulator_unittest.cc

Index: content/test/navigation_simulator_unittest.cc
diff --git a/content/test/navigation_simulator_unittest.cc b/content/test/navigation_simulator_unittest.cc
index 27638b794c5a5683db734ce346250f062ee1ded0..5174cb2a928b1e754f7b93f7eb0ee5f857e16faf 100644
--- a/content/test/navigation_simulator_unittest.cc
+++ b/content/test/navigation_simulator_unittest.cc
@@ -69,6 +69,10 @@ class CancellingNavigationThrottle : public NavigationThrottle {
     return ProcessState(cancel_time_ == WILL_PROCESS_RESPONSE);
   }
 
+  const char* GetNameForLogging() override {
+    return "CancellingNavigationThrottle";
+  }
+
   NavigationThrottle::ThrottleCheckResult ProcessState(bool should_cancel) {
     if (sync_ == ASYNCHRONOUS) {
       BrowserThread::PostTask(